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R. J. Watkinson and H. J. Somerville, The Microbial Utilisation of Butadiene, Shell Research Ltd., Sittingboume Research Centre, Kent, UK, 1976. 

The work on gas explosions at SiT-Tel-Tek is financially supported by Shell Research Ltd. The authors are grateful to Dr. R. A. Mancini, Amoco Corporation, for making this paper possible. 

Sir John Warcup Cornforth (1917-2004) was born in Sydney, Australia, and earned his Ph.D. from Oxford University in 1941 working with Sir Robert Robinson. He was on the staff of the National Institute for Medical Research in London from 1946 to 1962, at Shell Research Ltd. (1962-1975), and ultimately at Sussex University (1975-1982). Profoundly deaf since his teens, he worked in constant collaboration with his wife, Rita Harradence. He received the 1975 Nobel Prize in chemistry. 

Shell Research Ltd., Sittingbourne Research Centre, Sittingbourne, Kent, ME9 8AG, United Kingdom... 

The authors thank Shell Research, Ltd., for the provision of a studentship (P.W.J.). They also thank M. A. Warriss for helpful technical assistance. 

STEPHEN A. RICE Shell Research Ltd., Thornton Research Centre, Chester CHI 3SH, Gt. Britain Present address K.S.E.P.L. LRP/2, Shell Research B.V., 2280 AB Rijswijk ZH, The Netherlands... 

Shell Research, Ltd., Thornton Research Centre, P.O. Box 1, Chester, England... 

Shell Research Ltd., Woodstock Agricultural Research Centre, Sittingboume, Kent, England... 

Brown, V. K., Richardson, A., Robinson, J., Stevenson, D. E., Shell Research, Ltd., Tunstall Laboratory, Sittingbourne, Kent, in press. 

From 1990 to 1996, Dr Roberts was Director of Agrochemical and Environmental Services with Coming Hazleton (now Covance) and was with Shell Research Ltd for the previous 20 years. 

IAN D. ENTWISTLE and WILLIAM W. WOOD Shell Research Ltd, Sittingbourne, UK... 

Resonance absorption is most sensitive and its application is most straightforward when the emission line is not self-reversed and when it has a Doppler profile corresponding to a low translational temperature. " For molecules, the strength of an electronic transition is dissipated over many individual lines with the result that the emission and absorption intensity of any single line is generally less than for atoms. Although this lowers the sensitivity of the method, it also tends to reduce the problems which can arise from self-reversal of the lines emitted by the source. The OH radical is well suited to a study by resonance absorption because the intensity from a simple lamp emitting the A l,+ — X Il resonance system is concentrated in a few lines of the (0,0) band with low values of K, which are quite widely separated. present address Thornton Research Centre, Shell Research Ltd., P.O. Box 1, Chester. 

Shell Research Ltd. Carrington Plastics Lab., Ziegler Polyethylene Paper... 

The PP was supplied by Shell Research Ltd., completely free from additives (M 222,300). The PMMA (M 516,000) was prepared from monomer (HDH Ltd.) idilch was purified by washing with sodium hydroxide solution and distilled water, followed by drying and vacuum degassing and distillation. It was polymerized at 60°C under vacuum with azo-di-isobutyronltrile (0.1% w/v) as initiator and purified by precipitation three times by methanol from toluene solution followed by vacuum drying at 60 C. 

Nitrogen Oxides formed in Natural Gas/Air Flames, Prepr., Shell Research, Ltd., Egham Research Labs, Egham, Surrey, England. 

Biochemistry Department, Zoccon Corporation, Palo Alto, CA 94304 Department of Biochemistry, Shell Research Ltd., Sittingboume,... 

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